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TR-MO 2006 Problem 4

    n≥2n \geq 2 ve a1,a2,…,ana_1, a_2, \ldots, a_n pozitif gerçel sayılar olmak üzere

    t=a1+a2+⋯+an=a12+a22+⋯+an2t = a_1 + a_2 + \cdots + a_n = a_1^2 + a_2^2 + \cdots + a_n^2

    ise,

    ∑i≠jaiaj≥(n−1)2tt−1\sum_{i \neq j} \frac{a_i}{a_j} \geq \frac{(n-1)^2 t}{t-1}

    olduğunu gösteriniz.

    Official text Turkish Mathematical Olympiad 2006 official paper, page 2. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/claude@2.1.318 (claude-opus-5-5). No person has checked it against the paper yet.

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